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Collects excess tissue fluids

Lymphatic capillary

Drains lymph from specific body areas

Lymphatic trunk

Houses lymphatic cells

Lymph node

Drains right head and neck region

Right lymphatic duct

Larger of the two lymphatic ducts receiving lymph from all but the right head and neck region

Thoracic duct

A tubular offshoot from the cecum


Large collections of bean-shaped structures in the inguinal, axillary, and cervical regions

Lymph nodes

A filter and reservoir for the blood


Causes T cells to become immunocompetent


The simplest lymphoid organs


Same three tunics as veins; second-smallest lymph vessels tissue cells and blood capillaries in loose connective tissues; smallest vessels

Lymphatic collecting vessels

Same three tunics as veins; largest of lymph vessels

Lymphatic trunks

A type of loose connective tissue called reticular connective tissue; dominates all lymphoid organs except thymus

Lymphatic tissue

Bean-shaped structure surrounded by a dense fibrous capsule with fibrous strands that divide it into compartments

Lymph node

Vessels leading into lymph node

Afferent lymphatic vessels

A large, baglike sinus leading into a number of smaller sinuses

Subcapsular sinus

The indented region on the concave side of the node leading into the efferent vessels


Vessels leaving the lymph node

Efferent lymphatic vessels

Soft, blood-rich organ about the size of a fist (largest lymphoid organ)


Located in the inferior neck and extends into the superior thorax

Thymus gland

The simplest lymphoid organs; found around the entrance to the pharynx


Isolated clusters of lymph follicles located mostly in the wall of the appendix

Peyer's patches

Small lymphoid tissues found in digestive and respiratory tracts

Mucosa-associated lymphatic tissue (MALT)

Located within the germinal center of a lymph node

B cell

Located in the Deep cortex of a lymph node

T cell

Located in the surrounding the germinal center of a lymph node

Dendritic cells

Located in the medullary cords of a lymph node

Plasma cells

Located in the Lymph sinus of a lymph node


Protects the digestive and respiratory tracts from never-ending onslaughts of foreign matter entering mucosa lined cavities


Destroy bacteria in appendix; generate "memory" lymphocytes for long-term memory in intestine

Peyer's patches

Guard the throat by "inviting" bacteria into the lymphatic system and destroying them


Important in early years of life by training T lymphocytes to become immunocompetent


Provides a large, blood-filled site for lymphocyte proliferation and immune surveillance and response; cleanses the blood


Collects fluid that leaks from blood capillaries into tissue fluid

Lymphatic capillaries

Collect lymph fluid draining from lymphatic capillaries

Lymphatic collecting vessels

Largest vessels; carry lymph fluid to subclavian veins

Lymphatic ducts

Provides a proliferation site for lymphocytes and furnishes surveillance vantage point for lymphocytes and macrophages

Lymphoid tissue

Distinct bean-shaped structures that "filter" lymph fluid as it is moved toward the circulatory system

Lymph nodes

Begin as blind-ended tubes that weave between tissue cells and blood capillaries in loose connective tissues; smallest vessels

Lymphatic capillaries

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